In modern digital radio wireless communication, a transmitter (TX) sends data by transmitting a modulated electromagnetic (EM) wave, where typically the envelop of the EM wave varies according to a data signal. This data signal is typically an analog signal, but in digital wireless radio communication, only the signal points separated regularly in time carry information. The receiver (RX) receives an untidy mixture of attenuated and delayed versions (i.e., multipath) of the transmitted signal before the received signal being sampled and decoded. Nearly 50 years of wireless communication research efforts has been, and also is being, dedicated to perfect the detection of the desired signal from this untidy mixture of signals [1]}. The state-of-the-art of wireless communication is 5th-generation (5G) [2]}.
